Erro nativeQuery

Caused by: com.ibm.db2.jcc.b.nm: An unexpected token "1" was found following "_MES AS VARCHAR(10))".  Expected tokens may include:  "<space>".. SQLCODE=-104, SQLSTATE=42601, DRIVER=3.50.152

StringBuilder sbQuery = new StringBuilder();		
		sbQuery.append("SELECT CAST(SUBSTRING(CAST(recMeta.VL_ANO_MES AS VARCHAR(10))1,4)AS INTEGER)");
		sbQuery.append(" FROM TB_NOTA_RECURSO_META recMeta");
		sbQuery.append(" UNION");
		sbQuery.append(" SELECT CAST(SUBSTRING(CAST(recQuesito.VL_ANO_MES_REFERENCIA AS VARCHAR(10))1,4)AS INTEGER)");
		sbQuery.append(" FROM TB_NOTA_RECURSO_QUESITO recQuesito");
		sbQuery.append(" UNION");
		sbQuery.append(" SELECT av360.VL_ANO_REFERENCIA FROM TB_AVALIACAO_360 av360");
		
		Query query = em.createNativeQuery(sbQuery.toString());	
		
		List<Integer> resultList = query.getResultList();